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I have a '99 K2500 4X4with the 454. She runs great, even gets 16 mpg on the average, which I feel is pretty good for such a beast. My problem is with my 4WD switch. When I first got the truck about 7 months ago it worked just fine. I haven't had the need to engage the 4WD for about 4 months...

I have a 99 Tahoe with the 5.7 gas engine. This is apparently a split model year & mine is from the first half of the year. Here is my problem. When driving down the road, if I'm driving at a steady speed, I notice what I guess would be called hesitation. If I accelerate, it's nice & smooth...